Polaris axis finder
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorKozaburo Suzuki
Life of this patent
Estimating the term…
Abstract
A polar axis finder for an equatorial mounting telescope has an objective lens and a focus mirror having a Polaris collimating mark thereon disposed at a focal point of the objective lens. A time scale cylinder has a time scale thereon and the focus mirror is fixedly mounted within one end portion thereof. The time scale cylinder and the focus mirror can be rotated relative to a month scale cylinder having a date scale and an autumnal equinox point mark thereon, the latter being placed in alignment with a corresponding index provided on the telescope whereby polar axis alignment can be readily achieved with high accuracy.
Claims13
A polar axis finder for an equatorial mounting telescope, comprising:
- an objective lens;
- a focus mirror disposed at a focal point of said objective lens, said focus mirror being rotatable about an axis of rotation and having a Polaris collimating mark thereon which is asymmetrically disposed with respect to said axis of rotation;
- a date scale;
- a time scale fixedly secured for rotation with said focus mirror relative to said date scale;
- and
- an eyepiece for viewing an image of Polaris via said objective lens and focus mirror.
Dependencies are inferred from the claim text.